Examine source code of Website Opener

{
  "manifest_version": 2,
  "name": "Website Opener",
  "version": "1.2",
  "description": "An entension that opens websites",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Open websites with this."
  }
}